Tester of the Tangential 

Creature — Djinn Wizard
$0.20 #19929 0.00 0.5 years
Increment (Whenever you cast a spell, if the amount of mana you spent is greater than this creature's power or toughness, put a +1/+1 counter on this creature.)
At the beginning of combat on your turn, you may pay
. When you do, move X +1/+1 counters from this creature onto another target creature.
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Cards similar to Tester of the Tangential expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Skyrider Patrol78%
$0.13↓#236210.008.3 years↑
"At the beginning of combat on your turn, you may pay 
. When you do, put a +1/+1 counter on another target creature you control, and that creature gains flying until end of turn."
Spined Tyrranax77%
$0.23↑#217930.061.9 years↑
"At the beginning of combat on your turn, you may pay 
. When you do, put a +1/+1 counter on target creature. That creature gains trample until end of turn."
Ant-Man, Colony Commander76%
$0.19↓#160510.36↑0.3 years
"Whenever this card attacks, you may pay
. When you do, put a +1/+1 counter on target creature."
+1 more matching line
Matt Murdock, Justice Seeker76%
$0.87↑#14339↑0.36↑0.3 years
"At the beginning of combat on your turn, you may pay
. When you do, put a +1/+1 counter on target creature you control."
Steel Dromedary74%
$0.21↑#23928↓0.005.3 years↑
"At the beginning of combat on your turn, you may move a +1/+1 counter from this creature onto target creature."
+1 more matching line
Scrounging Bandar74%
$0.15↓#8879↑0.009.7 years↑
"At the beginning of your upkeep, you may move any number of +1/+1 counters from this creature onto another target creature."
+1 more matching line
Sample Collector73%
$0.05↓#29807↓0.002.7 years↑
"Whenever this creature attacks, you may collect evidence 3. When you do, put a +1/+1 counter on target creature you control."
Numa, Joraga Chieftain72%
$0.23↑#13466↑0.21↑5.9 years↑
"At the beginning of combat on your turn, you may pay 
. When you do, distribute X +1/+1 counters among any number of target Elves."
Go-Shintai of Boundless Vigor72%
$0.23↑#5848↑0.064.7 years↑
"At the beginning of your end step, you may pay
. When you do, put a +1/+1 counter on target Shrine for each Shrine you control."